Toz metalurjisi metoduyla üretilen Cr-C takviyeli Cu matrisli kompozitlerin mikroyapı ve mekanik özellikleri

Year 2017, Volume: 6 Issue: 2, 1 - 6, 16.12.2017

Özgür Özgün , Ali Erçetin

Abstract

Bu çalışmada saf Cu
tozu içerisine farklı oranlarda Cr ve C ilavesi yapılarak toz metalurjisi
tekniği (T/M) ile Cu matrisli kompozit malzemeler üretilmiştir.  Cu tozu içerisine farklı oranlarda Cr ve C
ilave edilerek elde edilen toz karışımları 300 MPa basınç uygulanarak
şekillendirilmiştir. Optimum sinterleme sıcaklığının tespit edilmesi amacıyla
şekillendirilen numuneler farklı sıcaklıklarda sinterlenmiştir. Sinterleme
işlemlerinin başarısı yoğunluk ölçümleri ile değerlendirilmiştir. Üretilen
kompozit numunelerin mikroyapı ve mekanik özellikleri karakterize edilmiştir.
Mikroyapısal karakterizasyon X-ışınları analizi (XRD), taramalı elektron
mikroskobu (SEM) ve enerji dağılım spektrometresi (EDS) incelemeleri ile
gerçekleştirilmiştir. Farklı oranlarda Cr ve C ilavesinin mekanik özelliklere
etkisi sertlik ölçümleri ve çekme testleri ile değerlendirilmiştir. Yoğunluk
ölçümleri artan Cr ve C oranıyla birlikte ulaşılabilen bağıl yoğunluk
değerlerinin arttığını göstermiştir. XRD analizi, Cr’un sinterleme işlemi esnasında
mikroyapıda karbür ve nitrür bileşikleri oluşturduğunu göstermiştir. Oluşan bu
bileşiklere bağlı olarak artan Cr ve C oranıyla birlikte elde edilen sertlik
değerleri de artmıştır.

Keywords

Cu, Cr-C, kompozit, mikroyapı, sertlik, çekme dayanımı

Microstructural and mechanical properties of Cr-C reinforced Cu matrix composites produced through powder metallurgy method

Abstract

    In this study, Cu matrix
composite materials were produced by powder metallurgy technique (PM) by adding
Cr and C at different ratios to pure Cu powder. Powder mixtures obtained by
adding Cr and C at various ratios into the Cu powder were shaped by applying a
pressure of 300 MPa. The specimens were sintered at different temperatures in
order to determine the optimum sintering temperature. The success of the
sintering process was evaluated by density measurements. The microstructure and
mechanical properties of the produced composite specimens are characterized.
Microstructural characterization was performed by X-ray diffraction (XRD),
scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS)
analyses. The effects of Cr and C addition on mechanical properties at
different ratios were evaluated by hardness measurements and tensile tests.
Density measurements have shown that the relative density values ​​that can be
achieved with increased Cr and C ratios are increased. XRD analysis showed that
Cr formed carbide and nitride compounds in the microstructure during sintering.
The hardness values ​​obtained with these Cr and C ratios increased with the
increase of these compounds.

Keywords

Cu, Cr-C, composite, microstructure, hardness, tensile strength

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